Add more missing closing namespace comments.

third_party/WebKit/Source/core/frame/NavigatorOnLine.h

 /*
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
 namespace blink {
 
 class NavigatorOnLine {
 public:
     bool onLine()
     {
         return networkStateNotifier().onLine();
     }
 };
 
-}
+} // namespace blink
 
 #endif // NavigatorOnLine_h